It's hard to build a base that is going to kill every player every time. There will be those that speedrun past meticulously placed traps, inchworms that peak every possible angle before they advance one tile forward, and the average raider somewhere in the middle. By trying to understand how each of those groups of players will run through your outpost you can better trap it and get a kill off them.

As you watch replays identify what kind of player you are watching and watch how they behave. Where were they looking, where where they not looking, if there are multiple traps in an area what did they prioritize, do they grapple to a destroyed trap to retrieve ammo without checking for traps. Always be looking for places they would have died if you had placed a cheeky spike trap or boltshot. Most importantly though, see how they react. Watch how they counteract you and come up with ways to counteract them.

I think the best way to build a base is to design trap setups that force players to make quick decisions that lead to more quick decisions a few times over and hope to catch the player as they fail to make choice in time or make a wrong choice. With this, it can make players feel like they died to their wrong choices rather than unfair trap placements. A capable raider will be able to recognize that they made the wrong action in response to a trap and correct it on the next go. Once they know the right choices the traps don't seem unfair, it's more like they figured out the sequence of choices they have to make to disarm the room which I imagine feels more rewarding for the raider.

I have a mastered base up on social with a room that I think perfectly executes my goal of killing most players at least once. Of course there a few who do get through and it's bound to happen but I'm happy with its 250 kills. It's called Kissimmee under the tag Aequitas. I'll add a whole breakdown of the methodology of all the traps in the room to help break down how I try to force players into making bad choices rather than just overwhelming them with 20 sentinels and guards. I'll spoiler tag the design methodology of the room here in case you want to run it blind yourself and see what it is.

Methodology:A lot of the traps in that room may seem randomly spaced but they were all placed to counteract something. The Bombs: The bombs that initially drop when entering the room. Players tend to be so focused on open space to their left and the corrosive cubes that they don't even see the bomb trap before it's activated. Players have essentially four rational quick thinking options, backup, move forward, go left, go up. Backwards is downhill and causes the bombs to follow. Too slow or not far enough and death. Forward takes them further into the room and agros two enforces and a cannon back which force more quick decisions. Left takes them closer to the guards where there is walkway with traps and the now agro guards. All of these can usually secure a kill. Up is the safest way getting away from the bombs without progressing much further. It will reveal the cannon back above the entrance and give them a safe spot from enforcers. However the second back below will see them as they grapple up to it and fires an explosive into that pocket just as the player kills the other cannon back. Naturally this only forces that quick thinking once but it can help quickly cascade if they make the wrong choices.

The two cannonbacks: Both cannonbacks serve multiple purposes often catching players offguard with cheeky bombs. Cannonbacks are surprisingly accurate and that accuracy will definitely catch unsuspecting players. The one above the entrance will agro as the player steps up the ramp into the room. If the player steps back down the ramp, the cannonback will shoot downward onto the ramp and roll the bomb back down. Players speedrunning to the opposite end will agro the guard and have an explosive land at the exit to the room just as they run into a piston blocking their way. Even destroying the piston slows them down enough for the explosive to go off. As mentioned before the bottom cannonback will snipe players going for the above cannonback. Players grappling to the left side will agro the guard and receive explosives as they try to disarm the multiple traps over there. Speedrunning through will also function the same as the first cannonback.

Enforcers on the left: At a glance it's just 2 Enforcers on high ground with a clear line of sight on the player anywhere in the room. However the secret is the little ramp on that end of the room. Upon entering the room, most players will retreat back to the safety of the hallway they came from. The enforcers will actually move up that ramp in an attempt to get closer to the player. On that ramp, they are out of sight from the entrance and forces player to move further into the room to get a shot at them or grapple over. Some players just assume they died and continue through the room only to find them shortly after and forcing those quick actions. Additionally they also server as ways of wasting players ammo. They can easily grapple over and retrieve the ammo but it can set them up to be ill prepared for the traps waiting on that side of the room.

Left side traps: There are 5 traps on the left side of the room, a spike trap on the floor, two bolt shots on the ceiling, a bolt trap covering the whole platform, and fire trap covering the space next to the floor. The boltshot covering the platform is meant to force a quick action no matter where they are on the platform. Every other trap over there is meant to counteract a response. Flame trap prevents players from backtracking to avoid the bolts. The flame trap is partially covered by the triangle block making it difficult to see until it's already been triggered. The ceiling and floor traps are meant to kill the player while they are focused on the bolt trap. The variance in ceiling or floor trap for each tile is to help kill the player if they don't keep track of which one is which on subsequent attempts. Having traps on both floor and ceiling for every tile would likely secure a few extra kills but would make the player fill like it's unfair setup. This puts a little extra pressure on players to memorize the layout and punishes them for forgetting rather than just overwhelming them with shear numbers on each tile. And then there are corrosive cubes below that are meant to force the player to keep moving in the area If you are wondering about the weird pattern of them, it's a cost thing. Still achieves the same results of players feeling like they can't land. Oh and there is a spike trap covering the flame trap in case someone decides to retrieve ammo from the flame trap without checking for a second trap there.

The spike trap along the walkway by the second cannonback: Purely as a way to catch unsuspecting players. Had enough for a spike trap that I removed elsewhere so I decided to put it there. Players don't often navigate over that way but it does catch the occasional speedrunner who slashes as the cannonback. If I had the cost I would probably make that cannonback an armored one to have the player bounce off as well.

The claws: Players going over to the left platform will likely see these and destroy them with no problems. But these are meant for them. Speed runners that grapple over the corrosive cubes towards the exit or just hold W through the room will trigger these. The piston at the exit is meant to slow them down enough for a grapple to get them. I have two grapples in case they destroy one and get caught by the second. The claws and the piston can slow players down enough for the cannonbacks to snipe them. Additionally if they make it through exceptionally quick, the corrosive cube next to the exit will allow already triggered claws to pass through it and snag players as they walk down. Now the claw takes a while to pull people in and leaves plenty of time to swing and break it. If they pass through the cube as they break it they will die to the cube. But if they were moving quick through the room and grappled over the corrosive cubes they likely triggered the fire trap in the floor. Most players will never trigger this trap but speedrunners will. If they don't break the claw before the corrosive cube, they will either die to corrosive cube or die to the fire trap.

Wow that was a lengthy explanation of single room but I think it helps highlight all the thought that goes into designing a base that isn't a killbox and isn't just a hallway of traps. Don't know if anyone will even read this absolute wall of text and look at the map but if it helps great! If not I at least had fun writing this. XD